Lassa Fever: Symptoms, Causes, Diagnosis and Treatment

Written by Medicover Team and Medically Reviewed by Dr Vamsi Krishna Kedarisetti , General Medicine

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Lassa Fever is an acute viral hemorrhagic illness caused by the Lassa virus, which is primarily transmitted through contact with the urine or droppings of infected multimammate rats. The disease is most common in parts of West Africa and can range from a mild illness to a severe, life-threatening infection affecting multiple organs. Early diagnosis and prompt treatment are essential to reduce complications and improve survival.

What are the Symptoms of Lassa Fever?

Early Symptoms

The onset of Lassa fever typically occurs 1-3 weeks after exposure to the virus. Early lassa fever symptoms are often nonspecific and can include:

Fever.
General malaise.
Weakness.
Headache.

These initial Lassa fever symptoms can mimic other common febrile illnesses, making early diagnosis challenging.

Severe Symptoms

As the disease progresses, more severe symptoms may develop, such as:

Hemorrhaging (e.g., gums, eyes, nose).
Respiratory distress.
Repeated vomiting.
Facial swelling.
Pain in the chest, back, and abdomen.
Shock.

In some cases, neurological problems like hearing loss, tremors, and encephalitis can occur. Approximately 20% of infected individuals experience severe disease.

What are the Causes of Lassa Fever?

The Causes of Lassa fever primarily involve exposure to the Lassa virus, which is transmitted by infected Mastomys rats. It spreads through contact with their urine, feces, or saliva. Human-to-human transmission occurs via bodily fluids, contaminated items, or medical equipment.

Key Causes:

Direct contact with infected rodents.
Consumption of contaminated food.
Exposure to infected individuals and fluids.

When to See a Doctor for Lassa Fever?

Anyone with fever, weakness, sore throat, or bleeding after traveling to or living in a Lassa-endemic region should seek immediate medical evaluation by an Infectious Disease Specialist or General Medicine Specialist.

You should see a doctor if you experience:

Persistent fever after possible exposure
Severe sore throat or facial swelling
Persistent vomiting or diarrhea

Seek emergency medical attention if:

Bleeding develops
Difficulty breathing occurs
Confusion, seizures, or signs of shock appear

These symptoms may indicate severe Lassa Fever requiring urgent hospitalization and specialized treatment.

No doctors found for Lassa Fever in any location.

How is Lassa Fever Diagnosed?

Diagnostic Methods

Accurate and timely diagnosis of Lassa fever is crucial for effective management and control. Diagnostic methods include:

Serology Tests: Detect antibodies against the Lassa virus.
Polymerase Chain Reaction (PCR): Identifies viral RNA in blood samples.
Virus Isolation: Involves culturing the virus from patient samples in specialized laboratories.

Challenges in Diagnosis

The nonspecific nature of early symptoms and the need for specialized laboratory facilities pose significant challenges to the timely diagnosis of Lassa fever. This often results in delayed treatment and increased risk of transmission.

How is Lassa Fever Treated?

Antiviral Treatment

Ribavirin, an antiviral drug, has been found to be effective in treating Lassa fever if administered early in the course of the disease. The drug works by inhibiting viral replication, thereby reducing the severity and duration of the illness.

Supportive Care

Supportive care is critical for managing Lassa fever and includes:

Maintaining hydration.
Managing symptoms such as fever and pain.
Treating secondary infections.

In severe cases, intensive care support may be required to manage complications such as respiratory distress and shock.

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How can Lassa Fever Be Prevented?

Reducing Rodent Exposure

Preventing Lassa fever involves reducing exposure to Mastomys rats and their excreta. Effective measures include:

Storing food in rodent-proof containers.
Keeping homes and surrounding areas clean to discourage rodent infestation.
Using traps and rodenticides.

Infection Control in Healthcare Settings

Healthcare workers should adhere to strict infection control protocols to prevent human-to-human transmission. This includes:

Using personal protective equipment (PPE) such as gloves, masks, and gowns.
Implementing proper hand hygiene practices.
Isolating suspected or confirmed cases.

Community Awareness and Education

Educating communities about the risks of Lassa fever and promoting preventive measures is vital for controlling the spread of the disease. Public health campaigns should focus on:

Recognizing early symptoms.
Seeking prompt medical attention.
Implementing preventive measures at home and in the community.

What is the Recovery Process for Lassa Fever?

Recovery depends on the severity of infection and how quickly treatment begins. Most people with mild disease recover completely, while severe cases may require prolonged hospitalization. Some survivors experience long-term complications such as hearing loss.

Regular follow-up is important to monitor recovery and manage any persistent complications.